Chapter 3 Front-Panel Operation and Features
Calibration Overview
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Calibration Overview
This section gives an overview of the calibration features of the power supply.
For more detailed discussion of the calibration procedures, see the Service
Information.
Calibration Security
This feature allows you to enter a security code to prevent accidental or
unauthorized calibrations of the power supply. When you first receive your
power supply, it is secured. Before you can calibrate the power supply, you
must unsecure it by entering the correct security code.
• The table 3-1 below shows the security code for each model when the power
supply is shipped from the factory. The security code is stored in non-
volatile memory, and does not change when power has been off or after a
power-on reset (
*RST
command).
• The security code may contain up to 11 alphanumeric characters or
underscore character (‘‘_’’). A letter (A-Z) or number (0-9) can be used for
the first character. You do not have to use all 11 characters.
_ _ _ _ _ _ _ _ _ _ _ (11 characters)
• When you secure the power supply from the remote interface, use maximum
8 alphanumeric characters to unsecure the power supply from the front
panel also. For example,
e3640A (less than 9 characters)
Table 3-1. Factory setting security codes
If you forget your security code, you can disable the security feature by
adding a jumper inside the power supply, and then entering a new code.
See the Service Information for more information.
Model Security
Code
Model Security
Code
Model Security
Code
E3640A 003640 E3641A 003641 E3642A 003642
E3643A 003643 E3644A 003644 E3645A 003645
